Those women could have diabetes, asthma, be pregnant, etc Just because someone is young and looks healthy doesn’t mean they don’t have underlying conditions. In addition, many teachers could have family members that are very vulnerable.
As I said, and I was quite clear about this, I do understand that and they could continue to shield. However, it is imperative that the population at large do not continue to do so.
To continue the shut down will lead to us running out of food. That isn't scaremongering, it is exactly what happens when...we stop growing and harvesting food. If we push the bulk of illness into winter, the NHS will be overwhelmed and we will begin to experience issues with critical services e.g. electricity. Again, stories in mainstream media.
There are few people as vulnerable as those starving in winter with the heating off.
This virus is here for the long run and a vaccine is far from guaranteed. Those of us at low risk need to get on with it otherwise everyone will suffer terribly.